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        <p><em>注意插件和loader版本问题,要适配webpack4.0</em></p>
<h3 id="Webpack自动刷新和模块热替换"><a href="#Webpack自动刷新和模块热替换" class="headerlink" title="Webpack自动刷新和模块热替换"></a>Webpack自动刷新和模块热替换</h3><h4 id="自动刷新"><a href="#自动刷新" class="headerlink" title="自动刷新"></a>自动刷新</h4><ol>
<li>iframe模式</li>
<li>inline模式</li>
</ol>
<h4 id="模块热替换（–hot-是指不需要完全刷新就能更新各个模块"><a href="#模块热替换（–hot-是指不需要完全刷新就能更新各个模块" class="headerlink" title="模块热替换（–hot): 是指不需要完全刷新就能更新各个模块"></a>模块热替换（–hot): 是指不需要完全刷新就能更新各个模块</h4><ul>
<li>要使用模块热替换需指定publicPath: 因为存在path的情况下,webpack-dev-server生成的包并没有放在你的真实目录中,而是放在了内存中</li>
<li>publicPath: 为项目中的所有资源指定一个基础路径<a id="more"></a>
</li>
</ul>
<h3 id="loader要怎么写？"><a href="#loader要怎么写？" class="headerlink" title="loader要怎么写？"></a>loader要怎么写？</h3><h4 id="写法有很多-简单点说话的方式简单点"><a href="#写法有很多-简单点说话的方式简单点" class="headerlink" title="写法有很多,简单点说话的方式简单点"></a>写法有很多,简单点说话的方式简单点</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">module</span>: &#123;</span><br><span class="line">    rules: [</span><br><span class="line">        &#123;</span><br><span class="line">            test: <span class="regexp">/\.js$/</span>,</span><br><span class="line">            exclude: <span class="regexp">/node_modules/</span>,</span><br><span class="line">            use: &#123;</span><br><span class="line">                loader: <span class="string">'babel-loader'</span>,</span><br><span class="line">                options: &#123;</span><br><span class="line">                    preset: [<span class="string">'env'</span>,<span class="string">'react'</span>]</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;,</span><br><span class="line">        &#123;</span><br><span class="line">            test: <span class="regexp">/\.less$/</span>,</span><br><span class="line">            user: [</span><br><span class="line">                <span class="string">'style-loader'</span>,<span class="string">'css-loader?modules'</span>,<span class="string">'less-loader'</span></span><br><span class="line">            ]</span><br><span class="line">        &#125;,</span><br><span class="line">        &#123;</span><br><span class="line">            test: <span class="regexp">/\.(jpg|png|svg|gif)$/</span>,</span><br><span class="line">            use: [<span class="string">'file-loader'</span>]</span><br><span class="line">        &#125;</span><br><span class="line">    ]</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<ul>
<li><p>file-loader<br>file-loader会把import进来的图片资源路径最后转换成输出目录图像的最终路径,同理css-loader也会将background-image:url(‘path’)一样处理</p>
</li>
<li><p>extract-text-webpack-plugin插件分离css后用html-webpack-plugin来动态加载css</p>
</li>
</ul>
<h3 id="plugins"><a href="#plugins" class="headerlink" title="plugins"></a>plugins</h3><h4 id="eslint"><a href="#eslint" class="headerlink" title="eslint"></a>eslint</h4><ul>
<li>在webpack中配置eslint-loader</li>
<li>.eslintrc.js中可配置extends:[“standard”]等规范</li>
<li>在rules：{}中添加自己的规范</li>
</ul>
<h4 id="tree-shaking"><a href="#tree-shaking" class="headerlink" title="tree-shaking"></a>tree-shaking</h4><ul>
<li>把没有调用的引用筛掉</li>
<li>然后<code>--optimize-minimize</code>: 最小化JavaScript并切换加载器以最小化</li>
</ul>
<h4 id="装饰器是transform-decorator-legacy"><a href="#装饰器是transform-decorator-legacy" class="headerlink" title="装饰器是transform-decorator-legacy"></a>装饰器是<code>transform-decorator-legacy</code></h4><h3 id="设置mode来快速"><a href="#设置mode来快速" class="headerlink" title="设置mode来快速"></a>设置mode来快速</h3><h4 id="development"><a href="#development" class="headerlink" title="development"></a>development</h4><ul>
<li>浏览器调试工具</li>
<li>开发阶段的详细错误日志和提示</li>
<li>快速和优化的增量构建机制</li>
</ul>
<h4 id="production"><a href="#production" class="headerlink" title="production"></a>production</h4><ul>
<li>开启所有的优化代码</li>
<li>更小的bundle大小</li>
<li>去除掉只在开发阶段运行的代码</li>
<li>Scope hoisting和Tree-shaking</li>
<li>自动启用uglifyjs对代码进行压缩</li>
</ul>
<h3 id="splitChunks代码分割"><a href="#splitChunks代码分割" class="headerlink" title="splitChunks代码分割"></a>splitChunks代码分割</h3><ul>
<li><code>optimization.splitChunks</code><ul>
<li>name: 命名</li>
<li>chunks: initial| all| async</li>
<li>minSize: </li>
<li>minChunks:</li>
<li>maxInitialRequest</li>
<li>cacheGroups: {}</li>
<li><a href="https://webpack.js.org/plugins/split-chunks-plugin/#optimization-runtimechunk" target="_blank" rel="noopener">更多</a></li>
</ul>
</li>
</ul>
<h3 id="lazyLoad"><a href="#lazyLoad" class="headerlink" title="lazyLoad"></a>lazyLoad</h3><h4 id="require-ensure"><a href="#require-ensure" class="headerlink" title="require.ensure"></a>require.ensure</h4><ul>
<li>语法: require.ensure(dependencies: String[], callback: function([require]), [chunkName: String])</li>
<li>dependencies: 依赖的模块数组</li>
<li>callback: 回调函数，该函数调用时会传一个require参数</li>
<li>chunkName: 模块名，用于构建时生成文件时命名使用<br>注意点：require.ensure的模块只会被下载下来，不会被执行，只有在回调函数使用require(模块名)后，这个模块才会被执行。</li>
</ul>
<h4 id="import-then"><a href="#import-then" class="headerlink" title="import.then"></a>import.then</h4><ul>
<li><code>import(/*webpackChunkName:&#39;testB&#39;*/&#39;./SubPageB&#39;).then((SubPageB)=&gt;console.log(SubPageB))</code></li>
<li>注释是webpack3的魔法注释,也就是打包后的文件名</li>
</ul>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-3"><a class="nav-link" href="#Webpack自动刷新和模块热替换"><span class="nav-number">1.</span> <span class="nav-text">Webpack自动刷新和模块热替换</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#自动刷新"><span class="nav-number">1.1.</span> <span class="nav-text">自动刷新</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#模块热替换（–hot-是指不需要完全刷新就能更新各个模块"><span class="nav-number">1.2.</span> <span class="nav-text">模块热替换（–hot): 是指不需要完全刷新就能更新各个模块</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#loader要怎么写？"><span class="nav-number">2.</span> <span class="nav-text">loader要怎么写？</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#写法有很多-简单点说话的方式简单点"><span class="nav-number">2.1.</span> <span class="nav-text">写法有很多,简单点说话的方式简单点</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#plugins"><span class="nav-number">3.</span> <span class="nav-text">plugins</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#eslint"><span class="nav-number">3.1.</span> <span class="nav-text">eslint</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#tree-shaking"><span class="nav-number">3.2.</span> <span class="nav-text">tree-shaking</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#装饰器是transform-decorator-legacy"><span class="nav-number">3.3.</span> <span class="nav-text">装饰器是transform-decorator-legacy</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#设置mode来快速"><span class="nav-number">4.</span> <span class="nav-text">设置mode来快速</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#development"><span class="nav-number">4.1.</span> <span class="nav-text">development</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#production"><span class="nav-number">4.2.</span> <span class="nav-text">production</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#splitChunks代码分割"><span class="nav-number">5.</span> <span class="nav-text">splitChunks代码分割</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#lazyLoad"><span class="nav-number">6.</span> <span class="nav-text">lazyLoad</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#require-ensure"><span class="nav-number">6.1.</span> <span class="nav-text">require.ensure</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#import-then"><span class="nav-number">6.2.</span> <span class="nav-text">import.then</span></a></li></ol></li></ol></div>
            

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